OpenOffice documents, WinAmp skins and Windows Media Player skins can be treated as common ZIP files. The 7-ZIP format is also supported and executable files can be precompressed with the UPX packer.

ZipGenius provides a side bar for common tasks and folder structure browsing. You can open more than one archive at once, and you can extract certain file types to specific folders. It also supports the CZIP 2.1 encryption format for self-decrypting archives.
You can also open multiple archives simultaneously and view them in a tabbed environment.